package collection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ListDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("one");
        list.add("two");
        list.add("three");
        list.add("four");
        list.add("five");
        list.add("one");
        System.out.println("list:"+list);
        String l = list.get(4);
        System.out.println("第五个元素是："+l);
        for (int i = 0;i <list.size();i++){
            System.out.println(list.get(i));
        }
        for (String s : list){
            System.out.println(s);
        }
        Iterator<String> it = list.iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
        String old = list.set(5,"six");
        System.out.println("old:"+old);
        System.out.println(list);
        list.remove(2);
        System.out.println(list);
        list.add(3,"seven");
        System.out.println(list);
    }
}
